I have a hard time believing Teslas do not has a sensor that disables the autopilot when no one is sitting in the driver's seat. If they don't, that sounds like a pretty good products liability case.
I bought seatbelt extenders for my Ram 1500. Just 4” long they plug into the seatbelt socket. Makes it easier to connect the seatbelt and when I'm futzing around off road I don't have to hear that annoying ‘ding...ding’. Also good for when I just don't feel like I need the thing to go get a coffee around the corner at 7-11.